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Cementation. Cathodic precipitation of a metal ion of a metal from solution by passing the solution over a more anodic (less noble) metal. Cu 2+ +2e = Cu (cathodic precipitation Fe = Fe 2+ + 2e (anodic dissolution). Cementation is less selective than gaseous reduction.

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slide1

Cementation

Cathodic precipitation of a metal ion of a metal from solution by passing the solution over a more anodic (less noble) metal

Cu2+ +2e = Cu (cathodic precipitation

Fe = Fe2+ + 2e (anodic dissolution)

Cementation is less selective than gaseous reduction

slide2

Isolation techniques

Ion exchange: organic resins on to which either cations or anions have been loosely bounded

Solvent extraction: organic compounds – ethers, esters, ketones- provide high solubility of some metallic and complex metal ions

Reverse osmosis: concentration of metal ions by passage of water from a dilute to a more concentrated solution through a semipermeable membranes

slide3

Electrowinning

Electrowinning of a metal is based on the electrolysis of aqueoussolutions or melts of metal salts with insoluble anode

slide10
Caron processs: laterite ore :  50% Fe - FeO.OH,

1-2% Ni - NiO,  0,1% Co - CoO

Boiling up/filtration

Laterite ore

NH3

NiCO3.Ni(OH)2

Drying, Grinding

H2, CO

Calcination

Reduction roasting

vzduch

NiO

NH3 aq. (NH4)CO3

Residue

Ammoniacal leaching

Preparation of electrolyte

H2SO4

Na2S CoS

Electrolysis

Partition Ni/Co

Ni 99,9%

Ni- liquor